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#
# The Python Imaging Library.
# $Id$
#
# im.show() drivers
#
# History:
# 2008-04-06 fl Created
#
# Copyright (c) Secret Labs AB 2008.
#
# See the README file for information on usage and redistribution.
#
from __future__ import print_function
import os
import subprocess
import sys
import tempfile
from PIL import Image
if sys.version_info.major >= 3:
from shlex import quote
else:
from pipes import quote
_viewers = []
def register(viewer, order=1):
try:
if issubclass(viewer, Viewer):
viewer = viewer()
except TypeError:
pass # raised if viewer wasn't a class
if order > 0:
_viewers.append(viewer)
elif order < 0:
_viewers.insert(0, viewer)
def show(image, title=None, **options):
r"""
Display a given image.
:param image: An image object.
:param title: Optional title. Not all viewers can display the title.
:param \**options: Additional viewer options.
:returns: True if a suitable viewer was found, false otherwise.
"""
for viewer in _viewers:
if viewer.show(image, title=title, **options):
return 1
return 0
class Viewer(object):
"""Base class for viewers."""
# main api
def show(self, image, **options):
# save temporary image to disk
if not (
image.mode in ("1", "RGBA") or (self.format == "PNG" and image.mode == "LA")
):
base = Image.getmodebase(image.mode)
if image.mode != base:
image = image.convert(base)
return self.show_image(image, **options)
# hook methods
format = None
options = {}
def get_format(self, image):
"""Return format name, or None to save as PGM/PPM"""
return self.format
def get_command(self, file, **options):
raise NotImplementedError
def save_image(self, image):
"""Save to temporary file, and return filename"""
return image._dump(format=self.get_format(image), **self.options)
def show_image(self, image, **options):
"""Display given image"""
return self.show_file(self.save_image(image), **options)
def show_file(self, file, **options):
"""Display given file"""
os.system(self.get_command(file, **options))
return 1
# --------------------------------------------------------------------
if sys.platform == "win32":
class WindowsViewer(Viewer):
format = "PNG"
options = {"compress_level": 1}
def get_command(self, file, **options):
return (
'start "Pillow" /WAIT "%s" '
"&& ping -n 2 127.0.0.1 >NUL "
'&& del /f "%s"' % (file, file)
)
register(WindowsViewer)
elif sys.platform == "darwin":
class MacViewer(Viewer):
format = "PNG"
options = {"compress_level": 1}
def get_command(self, file, **options):
# on darwin open returns immediately resulting in the temp
# file removal while app is opening
command = "open -a Preview.app"
command = "(%s %s; sleep 20; rm -f %s)&" % (
command,
quote(file),
quote(file),
)
return command
def show_file(self, file, **options):
"""Display given file"""
fd, path = tempfile.mkstemp()
with os.fdopen(fd, "w") as f:
f.write(file)
with open(path, "r") as f:
subprocess.Popen(
["im=$(cat); open -a Preview.app $im; sleep 20; rm -f $im"],
shell=True,
stdin=f,
)
os.remove(path)
return 1
register(MacViewer)
else:
# unixoids
def which(executable):
path = os.environ.get("PATH")
if not path:
return None
for dirname in path.split(os.pathsep):
filename = os.path.join(dirname, executable)
if os.path.isfile(filename) and os.access(filename, os.X_OK):
return filename
return None
class UnixViewer(Viewer):
format = "PNG"
options = {"compress_level": 1}
def get_command(self, file, **options):
command = self.get_command_ex(file, **options)[0]
return "(%s %s; rm -f %s)&" % (command, quote(file), quote(file))
def show_file(self, file, **options):
"""Display given file"""
fd, path = tempfile.mkstemp()
with os.fdopen(fd, "w") as f:
f.write(file)
with open(path, "r") as f:
command = self.get_command_ex(file, **options)[0]
subprocess.Popen(
["im=$(cat);" + command + " $im; rm -f $im"], shell=True, stdin=f
)
os.remove(path)
return 1
# implementations
class DisplayViewer(UnixViewer):
def get_command_ex(self, file, **options):
command = executable = "display"
return command, executable
if which("display"):
register(DisplayViewer)
class EogViewer(UnixViewer):
def get_command_ex(self, file, **options):
command = executable = "eog"
return command, executable
if which("eog"):
register(EogViewer)
class XVViewer(UnixViewer):
def get_command_ex(self, file, title=None, **options):
# note: xv is pretty outdated. most modern systems have
# imagemagick's display command instead.
command = executable = "xv"
if title:
command += " -name %s" % quote(title)
return command, executable
if which("xv"):
register(XVViewer)
if __name__ == "__main__":
if len(sys.argv) < 2:
print("Syntax: python ImageShow.py imagefile [title]")
sys.exit()
print(show(Image.open(sys.argv[1]), *sys.argv[2:]))
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